A canvas shop - any place that makes awnings or does boat covers would have the equipment to install a brass or stainless grommet. Check with "tack" shops (places that work with leather, saddles, bridles or other horse stuff).
There's a tack place that I go to locally. They have done everything from replace zippers in Cordura riding jackets, replace velcro on leather riding boots, make some quick disconnect buckle straps for soft saddle bags on my dual sport bikes. These places usually have some old-timers working there who are amazed to hear about knuckle-heads like us who ride off into the woods for days and days. Good folk.
No matter which way you go...it's likely to be cheaper than internation shipping from Europe.
Need my knees in the breeze through the trees.
'04 KTM 950 ADVENTURE (black) - '05 Honda XR650R (plated) - '97 Honda XR600R (plated) - '99 Honda Valkyrie Interstate (joy rides with my wife and kids)